Carburetor tube



Patented May 4, 1926.

UNITED I stares PATENT OFFICE.

'Jo'nn :u. wanna, or WILMINGTON, DELAWARE.

CABBURETOR TUBE.

Application filed November 28, 1923. Serial No. 677,465.

To all whom it may concern: Be it known that I, JOHN M. Mnn'rz, a citizen ofthe'United States, a resident of gWilmington, in the county of New Castle and State of Delaware, have invented a cer- J itain new and useful Carburetor Tube, 01

provide a carburetor tube in which the area v which the following is a specification.

"The primary object of the invention is to of the opening will be varied proportional "to the speed of the engine, thereby auto- I the tube increases and thereby increase the matically providing a larger amount of air, to compensate for increased fuel supply at higher velocities, when the engine is oper-j sting at higher speeds. A further object of the invention is to enable the above results to be brought about in a simple and effective manner, by the use 01E one or more spring members which form a Venturi throat in the carburetor tube, and are constructed to yield when the air velocity in area of the opening through which the air passes I I 1 Further object-s and advantages of the mvention will be in part obvious and in part specifically pointed out in theilQSCllpElOIl hereinafter contained, which, tal cn in connection with the accom anying drawings,

discloses a-preferred em odiment thereof;

such embodiment, however, isv to be considered 'as merely illustrative of its principles. Iii-the drawings: w Fi 1' is a longitudinal sectional view of a car uretor tube constructed in accordance c with the invention.v

Fig. 2 is a transverse section taken on line 2-2 of Fig. 1.

In the drawings I have shown a carbure tor tube 1 having suitable means torjeedirig fuel thereto, such as a nozzle 2 shown conventionally in-Fig. 2, and which may be adjusted in any suitable manner, as by a needle valve 3. As the general construction of: the

carburetor and other parts associated with tube 1 are'not essential to the present inven-' tion, they will not be described in detail herein.

The area oi the opening in tube 1 through which the ai" passes past the needleivalve 2 is determine ,by'cne or more spring members 4 which are somewhat bowed to form a Venturi throat-inthe tube adjacent needle valve 2, and the springmenibcrs tare made sufficiently resilien flatteniout upon increased air veloci y within the tube, and

' ['supporte thus enlarge the cross-sectional area of the.

.fiatten' out as above-described.

I also prefer-to provide some device for adqusting the spring members 4:, such as the thumb. screws6, which engage the free ends thereof.

In the present form of the invention the tube 1 is made of rectangular cross section,

' afid two of the springs 4: are provided at oppQsite side walls thereof; but it will be understood that this arrangement is not essen-, tial either as regards the shape of the tube or the number of springs employed.

For accurate regulation the spring members 4: may be constructed to compenf sate for temperature differences which may occur at diflerent seasons of the year, for enampleby constructing the springs in two pieces, with an outer layer 4* of bronze, and an inner layer P of steel or some other metal which expands relatively readily up-' on temperature lncreases.

The invention is also advantageous in that upon suddenly opening the butterfly valve or other volumetric air controlling device, there will be relatively little change in the mixture, due to the fact that the mixture remains practically constant at all air veloc ities instead of varying with the opening of the butterfly valve or other volumetric air controlling device.

While a specific embodiment of the in vention has been disclosed, it will be obvi ous that many changes may be made therein without departing from its essentialfea tures as set forth I claim:

1. In combination, a nozzle, a, carburetor tube surrounding the same, a spring member within saidtube normally bowed to form a throat adjacent said nozzle, said s ring member being suiiiciently resilient to i atten in the appended claims.

upon increased air yelocity within the tube ztfnd thus'enlsr e said throat, and being slidto permit one end to move freely when the spring flattens out as sfore said. i

2. In combination, a nozzle, a carburetor tube surrounding the same, a spring member Within said tube normally bowed to form a throatadjacent said nozzle, said spring member being sufiiciently resilient to flatten upon increased air velocity Within the tube and thus enlarge said throat, said spring member being fixedly secured in place adjacent one end and being slidably supported to permit the other end to move freely When the spring flattens out as aforesaid. I

3. In combination, a nozzle, a carburetor tube surrounding the same, a spring meniber Within said tube normally bowed to form a throat adjacent said nozzle, said spring member being sufficiently resilient to flatten upon increased air velocity within the tube and thus enlarge said. throat, and being slidably'supported to permit one end to move freely when the spring flattens out as aforesaid, together with means for adjusting the position "of said spring member.

at. In combination, a nozzle, a carburetor tube surrounding the same, a spring member Within said tube normally bowed to form a throat adjacent said nozzle, said spring member being sufficiently resilient to flatten upon increased air velocity within the tube and thus enlarge said throat, said spring member being-fixedly secured in place adjacent one end and being slidably supported to permit the other end to move freely when the spring flattens out as aforo" said, together with means engaging said last-2;;

mentioned end of the spring member for adjusting the position thereof. 4

In testimony that I claim the fore oingi. 4t1d y.

I have hereunto set my hand this 2 of November, 1923.

JOHN M. MERIZ: 

